Good Folks at Transnexus who did a performance test on OpenSER a while back, recently performed an in-depth performance test on Asterisk V1.4.11 configured as a SIP B2BUA. This test was conducted on a server with two Xeon 5140, dual core, 2.33 GHz CPUs and 4 GB of RAM.
The Good news is that they found an Asterisk B2BUA on this hardware can manage 1500 simultaneous calls with no transcoding and 400 simultaneous calls with G.711 to G.729 transcoding.
A summary of the test is available
The test details are available (PDF)
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